{"product_id":"sony-vgf-ap1-replacement-battery-37v-2200mah-li-ion","title":"Sony VGF-AP1 Replacement Battery 3.7V 2200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony VGF-AP1 \/ SAP1 — 3.7V Li-ion Replacement Battery (2-174-203-02)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2200mAh Li-ion replacement battery for the Sony VGF-AP1 and SAP1 portable media player. It replaces OEM part numbers 2-174-203-02 and 2-349-036-01. Fits the VGF-AP1L variant as well.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVGF-AP1, SAP1, and VGF-AP1L compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one battery fits all three without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the VGF-AP1 platform. The BMS accepted the cell without fault codes, held the voltage curve through full playback load, and reported state-of-charge correctly to the device firmware.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after deep storage:\u003c\/strong\u003e\n    The VGF-AP1 enters deep discharge protection when the cell drops below roughly 2.5V during long storage. If the device won't respond after install, connect the original charger and leave it for at least 30 minutes before attempting to power on — this allows the BMS to trickle-charge the cell out of protection mode before normal charge current resumes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping after a cell swap on the VGF-AP1\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe VGF-AP1 stores learned voltage-threshold data from the previous cell. When a new cell goes in, the firmware maps the old discharge curve onto different capacity characteristics, producing erratic percentage readings. This is not a fault with the replacement cell. Run two or three full charge-to-discharge cycles and the indicator recalibrates to the new cell's voltage profile. After that, the percentage display stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePlayback cutting out before the battery indicator shows empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe audio amplifier in the VGF-AP1 draws a current spike during loud passages that causes voltage sag at the end of a cell's discharge curve. Once cell voltage drops to around 3.2V, the amplifier can no longer sustain output voltage, and the device shuts down even though the indicator still shows a residual charge. This is a voltage-sag cutoff, not a faulty battery. A full recharge resolves it immediately — the device will show the remaining capacity it reported before shutdown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381351088218,"sku":"BWCS-SAP1SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381351120986,"sku":"BWCS-SAP1SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381351153754,"sku":"BWCS-SAP1SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SAP1SL-1.webp?v=1778900081","url":"https:\/\/batteryweb.com\/products\/sony-vgf-ap1-replacement-battery-37v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}